Method and device for reporting channel quality information

ABSTRACT

Measuring a Channel State Information-Reference Signal (CSI-RS) according to configuration information of the CSI-RS, to acquire a downlink channel transport matrix. Determining a Channel Quality Indicator (CQI) of a frequency domain reporting unit, according to a number of CSI-RS ports and the corresponding transmission scheme of a Physical Downlink Shared Channel (PDSCH) used when determining the CQI, and the downlink channel transport matrix being acquired by a measurement, Reporting the determined CQI to a network side.

The application requires the priority to Chinese patent application,which should be submitted to the Chinese Patent Office on Nov. 5, 2010,the application No. 201010537846.0, invention name as “Method and Devicefor Reporting Channel Quality Information”.

FIELD OF THE PRESENT INVENTION The present invention relates to wirelesscommunication field, in particular to a method and device for reportingchannel quality information. BACKGROUND OF THE PRESENT INVENTION

The LTE (Long Term Evolution) system adopts the physical layer frame onthe basis of OFDM (Orthogonal Frequency Division Multiplexing) and MIMO(Multiple-Input Multiple-Out-put) technologies. In order to adapt totransmission environment better, the LTE system adopts various kinds ofadaptive technologies. Based on different application scenes, 8 kinds ofdownlink transmission modes are defined in the LTE Rel-8/9 system, whileanother new kind of transmission mode needs to be defined in the Rel-10system to support top 8 layers' downlink MIMO transmission. Based on theadapting foundation of transmission mode, the eNB (evolved Node B) in TM(Transmission Mode) 4, 7, 8 and 9 is able to select downlinktransmission rank adaptively according to spatial characteristics ofchannels. Theoretically speaking, the network side is able to adjustdata rate of each data layer s through controlling modulation order andcode rate, so as to match transmission capability of each spatial datachannel precisely. However, considering control complexity and feedbackoverhead, the MIMO transmission of LTE system can support dynamicadjustment of at most 2-codeword MCS (Modulation & Coding Scheme).Within the transmission bandwidth of the LTE system, channel responseoften shows obvious frequency selectivity, thus the eNB can select UE(User Equipment) and schedule flexibly according to the channel stateand interference condition at each frequency band of each UE, so as toacquire frequency selective scheduling and multi-user diversity gain. Inthe mean time, the network side can allocate resources reasonablyaccording to channel state at each frequency band to avoid interferenceamong cells.

Channel quality information is the important foundation of all kinds ofadaptive adjustments and scheduling performed by the network side. TheLTE system quantizes channel quality into 4-bit CQI (Channel QualityIndicator), label of each CQI corresponds to an assembly of modulationmode and code rate, under which the UE should guarantee the errorprobability of receiving transmission block to be within 0.1.

When calculating CQI, the UE needs to assume the transmission scheme ofthe PDSCH (Physical Downlink Shared Channel) according to itstransmission mode. For example, when calculating the CQI defined in theLTE Rel-9 system, assumption mode of the PDSCH transmission scheme isshown in Table 1.

TABLE 1 Assumption of PDSCH Transmission Scheme When Calculating the CQITrans- mission Transmission scheme of mode PDSCH Description 1Single-antenna port, port 0 Single-antenna port, port 0 2 Transmitdiversity Transmit diversity 3 Transmit diversity if the Transmitdiversity if the associated rank indicator is 1, associated rankindicator is otherwise large delay CDD 1, otherwise large delay CDD(Cyclic Delay Diversity) 4 Closed-loop spatial Closed-loop spatialmultiplexing multiplexing 5 Multi-user MIMO Multi-user MIMO 6Closed-loop spatial Closed-loop spatial multiplexing with a singlemultiplexing with a single transmission layer transmission layer 7 Ifthe number of PBCH If the number of PBCH antenna ports is one, antennaports is 1, Single-antenna port, port 0; single-antenna port, port 0;otherwise Transmit diversity otherwise transmit diversity 8 If the UE isconfigured without If the UE is configured PMI/RI reporting: if thewithout PMI/RI reporting: if number of PBCH antenna the number of PBCHports is one, single-antenna antenna ports is 1, port, port 0; otherwisesingle-antenna port, port 0; transmit diversity otherwise transmitdiversity If the UE is configured with If the UE is configured withPMI/RI reporting: closed-loop PMI/RI reporting: spatial multiplexingclosed-loop spatial multiplexing

The CRS (Cell-specific Reference Signal)-based measurement anddemodulation mode are adopted in the transmission modes 1˜6 of the LTERel-8/9 system, while the CRS-based measurement and the DMRS(Demodulation Reference Signal)-based demodulation mechanism are adoptedin TM 7 and TM 8; wherein, in TM 2˜6, the UE needs to calculate andreport the recommended PMI (Precoding Matrix Indicator) according tomeasurement of the CRS; when reporting CQI, the UE assumes that the eNBuses the reported PMI. Non-codebook precoding mode is adopted in TM 7,the UE only needs to report the CQI to the eNB, then the eNB willcalculate precoding or figurative vector. Both the PMI and non-PMIfeedback modes are supported in the TM 9 system. Based on feedback modeof high-layer configuration and specific reporting mode, the UE cangenerate reporting content (including PMI/RI (Rank Indication)/CQI)according to the measurement of CRS. In the LTE-A (LTE Advanced) system,in order to support higher-order MIMO transmission (maximum supporting 8data layers) and multi-cell combined treatment function in subsequentversions, a newly defined CSI-RS (Channel State Information-ReferenceSignal) is introduced. The UE working in TM 9 cannot generate CQI/PMI/RIreporting information without the measurement of CSI-RS.

In the procedure of realizing the present invention, at least thefollowing problems exist in the current technologies:

In TM 9, for the transmission mode based PMI feedback, the UE can assumethat the eNB uses the reported PMI/RI. On this basis, the UE cancalculate the CQI of each codeword as per mode similar to closed-loopspatial multiplexing (such as TM 4 system). However, with regard tonon-PMI feedback-based transmission mode, no CSI-RS based measurement orreporting method for channel quality information exists currently.

SUMMARY OF THE PRESENT INVENTION

The embodiments of the present invention aim to provide a method anddevice for reporting channel quality information, so as to realizeCSI-RS-based measuring and reporting for channel quality information onthe basis of non-PMI feedback transmissions, for this purpose, theembodiments of the present invention adopt the following technicalscheme:

A method for reporting channel quality information, which comprises:measuring, by a User Equipment (UE), Channel State Information-ReferenceSignal (CSI-RS) according to configuration information of the CSI-RS, toacquire a downlink channel transport matrix;

determining, by the UE, Channel Quality Indicator (CQI) of a frequencydomain reporting unit, according to number of CSI-RS ports and thecorresponding transmission scheme of Physical Downlink Shared Channel(PDSCH) used when determining the CQI, and the downlink channeltransport matrix acquired by measurement;

reporting, by the UE, the determined CQI to network side. A UE, whichcomprises:

measurement module, used to measure CSI-RS according to theconfiguration information of the CSI-RS and acquire a downlink channeltransport matrix;

determination module, used to determine the CQI of a frequency domainreporting unit according to the number of CSI-RS ports and thecorresponding transmission scheme of the PDSCH used when determining theCQI, and the downlink channel transport matrix acquired by measurementmodule;

reporting module, used to report the CQI determined by the determinationmodule to the network side.

In the embodiments of the present invention mentioned above, the UEmeasures the CSI-RS, acquires a downlink channel transport matrix,determines and reports the CQI of a frequency domain unit according tothe downlink channel transport matrix as well as the transmission schemeof the PDSCH used when determining the CQI, realizes measurement andreporting of CSI-RS based channel quality information on the basis ofnon-PMI feedback transmissions.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow diagram of reporting channel quality information ofembodiments of the present invention;

FIG. 2 is a structural diagram of UE of embodiments of the presentinvention.

DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE PRESENT INVENTION

For the above existing problems of the current technology, theembodiments of the present invention put forward a non-PMI feedbackmode-based method for reporting channel quality information.

In the following parts, detailed descriptions of embodiments of thepresent invention are made combined with drawings of the embodiments.

FIG. 1 is referred to as the flow diagram of reporting channel qualityinformation of embodiments of the present invention; which comprises:

Step 101, the UE acquires the configuration information of CSI-RS. To bespecific, the UE can acquire the configuration information of the CSI-RSaccording to system broadcast mode, viz. the UE can monitor thebroadcast information of the network side and acquire the carriedconfiguration information of the CSI-RS. The CSI-RS configurationinformation includes time-frequency position of the CSI-RS, transmissioncycle, the number of ports for transmission of CSI-RS, etc.

Step 102, the UE measures the CSI-RS according to the configurationinformation of the CSI-RS, so as to acquire a downlink channel transportmatrix.

Wherein, according to the transmission cycle of the CSI-RS, the UE canmeasure the CSI-RS transmitted from the time-frequency positionindicated by the configuration information of the CSI-RS. The UE canacquire a downlink channel transport matrix by measurement of theCSI-RS, and the channel transport matrix could be shown as follows:

$\begin{matrix}{H = \begin{bmatrix}h_{11} & \ldots & h_{1T} \\\vdots & \ddots & \vdots \\h_{R\; 1} & \ldots & h_{RT}\end{bmatrix}} & \lbrack 1\rbrack\end{matrix}$

The UE can further measure the received interference and noise.

Step 103, the UE determines and reports CQI to the network sideaccording to the downlink channel transport matrix acquired bymeasurement of the CSI-RS and to the assumed transmission scheme of thePDSCH used when determining the CQI.

Wherein, before reporting CQI, the UE has acquired the transmissionscheme of the PDSCH used when calculating the CQI. To be specific, thetransmission scheme of the PDSCH used when calculating the CQI could bepreconfigured to the UE and base station, so that the UE and the eNBwill know the transmission scheme of the PDSCH used when calculating theCQI before UE reporting CQI. Based on the reporting mode configured bythe high-layer, the UE can calculate and report the CQI for eachfrequency domain reporting unit (such as broadband or sub-band)according to the transmission scheme of the PDSCH used when calculatingthe CQI.

Wherein, reporting mode configured by the high-layer includes one of thefollowing:

PUCCH (Physical Uplink Control Channel) reporting mode 1-0;

PUCCH reporting mode 2-0;

PUSCH (Physical Uplink Shared Channel) reporting mode 2-0;

PUSCH reporting mode 3-0.

In the embodiments of the present invention, the transmission scheme ofthe PDSCH used when calculating the CQI comprising:

the UE assumes the PDSCH is transmitted through single-port (such asport 0), when the number of CSI-RS ports is 1;

the UE assumes the PDSCH is transmitted through CRS port by transmitdiversity scheme when the number of CSI-RS ports is larger than 1.

Wherein, when the number of CSI-RS ports is larger than 1, specificcondition comprising:

If the number of CSI-RS ports is 2, the UE assumes the PDSCH istransmitted through two CRS ports (such as port 0 and 1) and istransmitted by two-port transmit diversity scheme, such as SFBC(Space-Frequency Block Coding);

If the number of CSI-RS ports is 4, the UE assumes the PDSCH istransmitted through four CRS ports (such as port 0 to 3) and istransmitted by 4-port transmit diversity scheme, such as SFBC₊FSTD(Frequency Switched Transmit Diversity);

If the number of CSI-RS ports is 8, the UE assumes the PDSCH istransmitted through two CRS ports (such as port 0 to 1) and istransmitted by 2-port transmit diversity scheme; or the UE assumes thePDSCH is transmitted through four CRS ports (such as port 0 to 3) byfour-port transmit diversity scheme.

Furthermore, it comprising:

If the PDSCH is assumed to be transmitted through two CRS ports (such asport 0 and 1), the UE further assumes the channel matrix acquired by themeasurement of CRS port 0 and 1 is HW.

Where W represents an 8×2 dimension matrix, H represents a downlinkchannel transport matrix acquired by UE's measurement of the CSI-RS. Ifthe PDSCH is assumed to be transmitted through four CRS ports (such asport 0 to 3), the UE further assumes the channel matrix acquired bymeasurement of CRS port 0 to 3 is HW, where W represents an 8×4dimension matrix, H represents a downlink channel transport matrixacquired by UE's measurement of the CSI-RS.

The assumed number of CRS ports and the matrix W used when the UE iscalculating the CQI are predetermined before reporting, and are known tothe UE and the network side.

The matrix W could be an 8xR dimension matrix, where R is equal to 2 or4, representing the number of CRS ports used when the UE is calculatingthe CQI via transmitting diversity by the PDSCH. W could be a certainpredefined matrix or calculated by a fixed order or selected from amatrix set as per a certain sequence; wherein, specific definition orcalculation or selection rule could be determined according torealization requirements or actual application. For example, matrix Wcould be generated from the following methods:

EXAMPLE 1

the only one element of each column of martix W is 1, while otherelements are all 0. When R is equal to 2, W could be set as

$W = \begin{bmatrix}1 & 0 \\0 & 1 \\\vdots & \vdots \\0 & 0\end{bmatrix}$

EXAMPLE 2

where D and U are both R×R matrixes, their values are shown in Table 2.P represents an 8×R precoding matrix selected from LTE-A8 antennacodebook by some certain order. Wherein, i=0,1, . . . , M_(symb)^(layer)−1, M_(symb) ^(layer) represents the number of symbols in eachdata layer.

TABLE 2 D and U Matrixes R U D(i) 2 $\frac{1}{\sqrt{2}}\begin{bmatrix}1 & 1 \\1 & e^{{- {j2\pi}}\text{/}2}\end{bmatrix}$ $\begin{bmatrix}1 & 0 \\0 & e^{{- {j2\pi i}}\text{/}2}\end{bmatrix}\quad$ 4 $\frac{1}{2}\begin{bmatrix}1 & 1 & 1 & 1 \\1 & e^{{- {j2\pi}}\text{/}4} & e^{{- {j4\pi}}\text{/}4} & e^{{- {j6\pi}}\text{/}4} \\1 & e^{{- {j4\pi}}\text{/}4} & e^{{- {j8\pi}}\text{/}4} & e^{{- {j12\pi}}\text{/}4} \\1 & e^{{- {j6\pi}}\text{/}4} & e^{{- {j12\pi}}\text{/}4} & e^{{- {j18\pi}}\text{/}4}\end{bmatrix}$ $\begin{bmatrix}1 & 0 & 0 & 0 \\0 & e^{{- {j2\pi i}}\text{/}4} & 0 & 0 \\0 & 0 & e^{{- {j4}}{\pi i}\text{/}4} & 0 \\0 & 0 & 0 & e^{{- {j6\pi i}}\text{/}4}\end{bmatrix}\quad$

EXAMPLE 3

when R is equal to 2,

${W = \begin{bmatrix}W_{1} & 0 \\0 & W_{2}\end{bmatrix}},$

wherein, w₁ and w₂ are both 4×1 dimension column vectors and theirelements are not all 0;

When R is equal to 4,

${W = \begin{bmatrix}W_{1} & \; & \; & \; \\\; & W_{2} & \; & \; \\\; & \; & W_{3} & \; \\\; & \; & \; & W_{4}\end{bmatrix}},$

where w₁ to w₄ are all 2×1 dimension column vectors and their elementsare not all 0.

It should be noted that, the UE can measure the CSI-RS and report theCQI according to the transmission cycle of the CSI-RS after acquiringthe configuration information of the CSI-RS. As long as theconfiguration information of the CSI-RS remains unchanged, the UE canalways measure the CSI-RS according to the configuration information.When the configuration information of the CSI-RS changes, the networkside could inform the updated configuration information of the CSI-RS bybroadcast mode, and the UE could then measure the CSI-RS and report theCQI after receiving the updated configuration information of the CSI-RS.

The UE could also acquire the configuration information of the CSI-RS inother ways besides the broadcast mode mentioned above.

Based on the same technical design, the embodiments of the presentinvention provide a UE which could be applied to the flow mentionedabove.

As is shown in FIG. 2, the UE provided by embodiments of the presentinvention includes:

Measurement module 201, which is used to measure the CSI-RS according tothe configuration information of the CSI-RS, and acquire a downlinkchannel transport matrix;

Determination module 202, which is used to determine the CQI of afrequency domain reporting unit according to the number of CSI-RS portsand the corresponding transmission scheme of the PDSCH used whendetermining the CQI, and to the downlink channel transport matrixacquired by measurement;

Reporting module 203, which is used to report the CQI determined by thedetermination module to the network side.

The UE could also include memory module 204, which is used to save thetransmission scheme information of the PDSCH, the transmission scheme ofthe PDSCH includes:

When the number of CSI-RS ports is 1, the PDSCH is assumed to betransmitted through single-port;

When the number of CSI-RS is larger than 1, the PDSCH is assumed to betransmitted through CRS port by transmit diversity scheme.

In the UE mentioned above, for the transmission scheme information ofthe PDSCH in the memory module 204, when the number of CSI-RS ports islarger than 1, the PDSCH is assumed to be transmitted through CRS portby transmit diversity scheme, to be specific, includes:

If the number of CSI-RS ports is 2, the PDSCH is assumed to betransmitted through 2 CRS ports by two-port transmit diversity scheme;

If the number of CSI-RS ports is 4, the PDSCH is assumed to betransmitted through 4 CRS ports by 4-port transmit diversity scheme;

If the number of CSI-RS ports is 8, the PDSCH is assumed to betransmitted through 2 CRS ports by two-port transmit diversity scheme,or the PDSCH is assumed to be transmitted through 4 CRS ports byfour-port transmit diversity scheme.

In the UE mentioned above, for the transmission scheme information ofthe PDSCH in memory module 204, the transmission scheme of the PDSCHalso includes:

If the UE assumes that the PDSCH uses 2 CRS ports, the UE will furtherassume the channel matrix acquired by measurement of 2 CRS ports is HW,where H represents a downlink channel transport matrix acquired bymeasurement of CSI-RS, and W represents an 8×2 dimension matrix. In theUE mentioned above, for the transmission scheme information of the PDSCHin the memory module, the transmission scheme of PDSCH also includes:

If the UE assumes that the PDSCH uses 4 CRS ports, the UE will furtherassume the channel matrix acquired by measurement of 4 CRS ports is HW,where H represents a downlink channel transport matrix acquired bymeasurement of CSI-RS, and W represents an 8×4 dimension matrix.

In the UE mentioned above, the assumed number of CRS ports and theMatrix W used when determination module 202 is determining the CQI arepredetermined before reporting by the UE, and are known to the UE andthe network side.

In the UE mentioned above, mode of reporting the CQI by reporting moduleis 203 is one of the following:

PUCCH reporting mode 1-0;

PUCCH reporting mode 2-0;

PUSCH reporting mode 2-0;

PUSCH reporting mode 3-0.

The UE mentioned above could also include acquiring module 205, which isused to acquire the configuration information of the CSI-RS by broadcastmode, and to save the configuration information of the CSI-RS intomemory module 204.

Through the description of the embodiments of the present invention, theUE acquires a downlink channel transport matrix by measuring the CSI-RS,determines and reports the CQI according to the downlink channeltransport matrix as well as the preconfigured transmission scheme of thePDSCH used when determining the CQI, realizes measurement and reportingof CSI-RS-based channel quality information on the basis of non-PMIfeedback transmissions. Wherein, the embodiments of the presentinvention configures different transmission schemes of the PDSCH withregard to the number of CSI-RS ports so as to improve the systemadaptability and flexibility.

The technical personnel in this field can be understood that the modulescan be distributed in device of the embodiments according to thedescription of the embodiments above, and also can be varied in one ormultiply device of the embodiments. The modules of the embodiments canbe combined into a module, and also can be further split into severalsub-modules.

Through the description of the embodiments above, the technicalpersonnel in this field can understand clearly that the presentinvention can be implemented by software and necessary general hardwareplatform or hardware (the former is better in most cases). Based on thisunderstanding, the technical scheme or the part making contributions tothe prior art of the present invention can be embodied by a form ofsoftware products essentially which can be saved in a storage medium,including a number of instructions for making a computer device (such aspersonal computers, servers, or network equipments, etc.) implement themethods described in the embodiments of the present invention.

The descriptions above are only preferred embodiments, it should bepointed out, that for general technical personnel in this field, on thepremise of not breaking away from principles of the present invention,some improvements and decorating can be done, which should be as theprotection scope of the present invention.

1. A method for reporting channel quality information, the method usingnon-Precoding Matrix Indicator (non-PMI) feedback for a transmissionmode, the method comprising: measuring, by a User Equipment (UE), aChannel State Information-Reference Signal (CSI-RS) according toconfiguration information of the CSI-RS, to acquire a downlink channeltransport matrix; determining, by the UE, a Channel Quality Indicator(CQI) of a frequency domain reporting unit, according to a number ofCSI-RS ports and the corresponding transmission scheme of a PhysicalDownlink Shared. Channel (PDSCH) used when determining the CQI, and thedownlink channel transport matrix being acquired by a measurement; andreporting, by the UE, the determined CQI to a network side, wherein thetransmission scheme of the PDSCH comprises: the PDSCH is assumed to betransmitted through single-port when the number of CSI-RS ports is 1,and the PDSCH is assumed to be transmitted through Cell-specificReference Signal CRS port ^(by,) a transmit diversity scheme when thenumber of CSI-RS ports is larger than
 1. 2. The method of claim 1,wherein the PDSCH is assumed to be transmitted through CRS port by thetransmit diversity scheme when the number of CSI-RS ports is larger than1, comprises: the PDSCH is assumed to be transmitted through 2 CRS portsby two-port transmit diversity scheme, when the number of CSI-RS portsis 2, the PDSCH is assumed to be transmitted through 4 CRS ports, by a4-port transmit diversity scheme, if the number of CSI-RS ports is 4,and the PDSCH is assumed to be transmitted through 2 CRS ports, by atwo-port transmit diversity scheme, or the PDSCH is assumed to betransmitted through 4 CRS ports, by a four-port transmit diversityscheme, if the number of CSI-RS ports is
 8. 3. The method of claim 2,wherein the transmission scheme of the PDSCH also comprises: furtherassuming, by the UE, the channel matrix acquired by measurement of 2 CRSports is HW, if the UE assumes that the PDSCH uses 2 CRS ports, where Hrepresents the downlink channel transport matrix acquired by measurementof CSI-RS, and W represents an 8×2 dimension matrix.
 4. The method ofclaim 3, the transmission scheme of the PDSCH also comprises: furtherassuming, by the UE, the channel matrix acquired by measurement of 4 CRSports is HW, if the UE assumes that the PDSCH uses 4 CRS ports, where Hrepresents the downlink channel transport matrix acquired by measurementof CSI-RS, and W represents an 8×4 dimension matrix.
 5. The method ofclaim 4, wherein, the assumed number of CRS ports and matrix W used whendetermining the CQI are predetermined before reporting by the UE, andare known to the UE and the network side.
 6. The method of claim 1,wherein the mode for reporting the CQI by the UE is one of thefollowing: Physical Uplink Control Channel PUCCH reporting mode 1-0;PUCCH reporting mode 2-0; Physical Shared Control Channel PUSCHreporting mode 2-0; and PUSCH reporting mode 3-0.
 7. The method of claim1, wherein the UE acquires the configuration information of the CSI-RSby broadcast mode.
 8. A. User Equipment (UE) using non-Precoding MatrixIndicator (non-PMI) for a transmission mode, comprising: a processorconfigured as: a measurement module, the measurement module beingconfigured to measure CSI-RS according to the configuration informationof the CSI-RS and acquire a downlink channel transport matrix; adetermination module, the determination module being configured todetermine the CQI of a frequency domain reporting unit according to thenumber of CSI-RS ports and the corresponding transmission scheme of thePDSCH used when determining the CQI, and the downlink channel transportmatrix acquired by measurement module; and a reporting module, thereporting module being configured to report the CQI determined by thedetermination module to the network side; and a memory device, thememory device being configured to save the transmission scheme of thePDSCH, wherein the transmission scheme of the PDSCH includes: the PDSCHis assumed to be transmitted through single-port when the number ofCSI-RS ports is
 1. and the PDSCH is assumed to be transmitted throughCRS port by a transmit diversity scheme when the number of CSI-RS portsis larger than
 1. 9. The UE of claim 8, wherein, for the information ofthe transmission scheme of the PDSCH saved by the memory device, thePDSCH is assumed to be transmitted through CRS port by transmitdiversity scheme when the number of CSI-RS ports is larger than 1, andspecifically includes: the PDSCH is assumed to be transmitted through 2CRS ports by two-port transmit diversity scheme, if the number of CSI-RSports is 2; the PDSCH is assumed to he transmitted through 4 CRS portsby 4-port transmit diversity scheme, if the number of CSI-RS ports is 4;and the PDSCH is assumed to be transmitted through 2 CRS ports bytwo-port transmit diversity scheme, or the PDSCH is assumed to betransmitted through 4 CRS ports by four-port transmit diversity scheme,if the number of CSI-RS ports is
 8. 10. The UE of claim 9, wherein, forthe transmission scheme information of the PDSCH saved by the memorydevice, the transmission scheme of the PDSCH also includes: furtherassuming, the UE, the channel matrix acquired by measurement of 2 CRSports is HW, if the UE assumes that the PDSCH uses 2 CRS ports, where Hrepresents a downlink channel transport matrix acquired by measurementof CSI-RS, and W represents an 8×2 dimension matrix.
 11. The UE of claim9, wherein, for the transmission scheme information of the PDSCH savedby the memory module, the transmission scheme of the PDSCH alsoincludes: further assuming, the UE, the channel matrix acquired bymeasurement of 4 CRS ports is HW, if the UE assumes that PDSCH uses 4CRS ports, where H represents a downlink channel transport matrixacquired by measurement of CSI-RS, and W represents an 8×4 dimensionmatrix,
 12. The UE of claim 11, wherein, the assumed number of CRS portsand matrix used when the determination module is determining the CQI arepredetermined before reporting by the UE, and are known to the UE andthe network side.
 13. The UE of claim 8, wherein the mode of reportingthe CQI by the reporting module is one of the following: PUCCH reportingmode 1-0; PUCCH reporting mode 2-0; PUSCH reporting mode 2-0; and PUSCHreporting mode 3-0.
 14. The UE of claim 9, wherein the processor isfurther configured as: an acquiring module, the acquiring module beingconfigured to acquire the configuration information of the CSI-RS bybroadcast mode.
 15. The method of claim 1, wherein the assumed number ofCRS ports and matrix W used when determining the CQI are predeterminedbefore reporting by the UE, and are known to the UE and the networkside.
 16. The UE of claim 8, wherein the assumed number of CRS ports andmatrix W used when the determination module is determining the CQI arepredetermined before reporting by the UE, and are known to the UE andthe network side.